Release Notes: Updates were made in codec support. Timing base
for gsm codec was added. The g.721/g.723/g.726
family of adpcm codecs was introduced, along with
new raw adpcm .a24/.a32/.a40 file extensions.

Release Notes: Support for g.721 and oki adpcm codecs has been added. There is a new internal codec plugin API with better support for codecs that require buffering, multiple frame sizes, and data stream sychronization. Support for packet-oriented file I/O to feed RTP packet streams. Support for sample rate conversion. Audiotool now supports sample rate conversion and dialogic .vox format when converting audio file formats with --build.

Release Notes: Key fixes in MP3 file container support. The padding value is now recalculated correctly for each get/put buffer operation. id3_2 headers are now properly decoded to find the offset of the first audio fragment. Additional functionality in audiotool when examining MPEG audio files.

Release Notes: Very preliminary support for accessing MPEG-encoded audio data from within MPEG audio container files. Files with ID3.2 headers are broken, as offset to first MPEG audio fragments do not appear to match id3_2 reported header length. Overall changes for supporting packet-oriented reading/writing of audio data, such as for accessing MPEG audio data, and for future .ogg container audio support.

Release Notes: This release features a new GSM plugin codec to support
gsm audio. New encoder to encoder stream conversion
functions were added for automatically transcoding audio
from one encoded form to another. with smart buffering
optimizations and direct frame transfer when converting to
same frame type. There is better support for audio file
extensions and extension to encoder mapping, and the use
of timestamp based file positioning. There is also complete
class documentation.

Release Notes: New frame-based tone generation classes were
added, including tone generation for dtmf and mf
dialing, as well as for sequencing of telephony
tones. Support for processing a localized tone
definitions database and generation of localized
tones by nation has been included. A new
standalone "tonetool" utility was added to create
and examine files containing telephony tones. Some
important bugs were fixed, as well as support for
updating internal audio data size when closing a
modified .au file.